html {
    width: 100%;
    height: 100%;

    body {
        width: 100%;
        height: 100%;

        .header {
            width: 100%;
            box-sizing: border-box;
            padding: 0 20px;
            justify-content: space-between;
            line-height: 56px;
            border-bottom: 1px solid #ddd;

            li {
                color: #9a9a9a;
                font-size: 16px;

                &.on {
                    font-weight: bold;
                    font-size: 20px;
                    color: #4294ff;
                    border-bottom: 3px solid #aad9f7;

                }
            }
        }

        main {
            width: 100%;
            overflow-x: hidden;
            overflow-y: scroll;

            .sellCourse {
                padding-top: 10px;
                width: 97%;
                margin-bottom: 20px;

                h3 {
                    width: 100%;
                    font-weight: normal;
                    margin-bottom: 10px;
                    margin-left: 20px;
                }

                .course {
                    width: 97%;
                    height: 240px;
                    border-radius: 20px;
                    box-shadow: 0px 5px 10px #aaa;

                    .course-top {

                        img {
                            width: 100%;
                            height: 180px;
                            border-radius: 20px 20px 0 0;
                        }
                    }

                    .course-bu {
                        box-sizing: border-box;
                        padding: 3px 10px;

                        h4 {
                            font-weight: normal;
                            line-height: 22px;
                        }

                        p {
                            line-height: 20px;
                            color: #9a9a9a;
                            white-space: nowrap;
                            text-overflow: ellipsis;
                            overflow: hidden;
                        }
                    }
                }
            }

            //
            .courselist {
                width: 100%;
                padding: 0 10px;
            
                ul {
                    flex-wrap: wrap;
                    justify-content: space-around;
                    align-content: space-around;
                    li {
                        background-size: cover;
                        position: relative;
                        width: 100%;
                        height: 160px;
                        border-radius: 10px;
                        box-shadow: 2px 4px 8px #ccc;
                        margin-bottom: 10px;
                        overflow: hidden;
                        a{
                            color: #fff;
                            img{
                                width: 100%;
                                height: 100%;
                            }
                            div{
                                width: 100%;
                                position: absolute;
                                bottom: 10px;
                                box-sizing: border-box;
                                padding-left: 10px;
                                h4{
                                    margin-bottom: 5px;
                                }
                                p{
                                    white-space: nowrap;
                                    text-overflow: ellipsis;
                                    overflow: hidden;
                                }
                            }
                        }
                       

                    }
                }
            }
        }
    }
}